A computer-assisted instruction (CAI) project designed a system to teach the elementary properties of statistical distributions in a probability course. It was used to reinforce teacher material with graphic displays and to provide laboratory exercises, the objectives being to promote easier grasp and retention of subject matter. The system developed was capable of displaying: 1) probability functions and cumulative distribution functions for discrete distributions; 2) probability density functions and cumulative distribution functions for continuous distributions; and 3) random samples, with resulting frequency distributions. The hardware utilized included an IBM 2250 Display Unit Model 1 attached to an IBM Systems/360 Model 40 computer with 256K bytes of memory. Trial use indicated that the system aided teaching; students reacted favorably, and they were able to complete the laboratory exercises. The system was easy to use and provided fast and reliable responses. Also, the interactive graphics display mode possessed additional advantages over drawings of distributions. These included: 1) the variation of parameters, thus allowing a huge number of displays; 2) superposition, to compare shapes of distributions; 3) zooming capability to allow variation of an abscissa or ordinate; 4) increased student motivation. (PB)